Dry Bone Fracture Pattern
Definition
Straight, longitudinal fractures running parallel to the long axis of a bone, following the Haversian structural directions; characteristic of bone burned after desiccation (longer postmortem interval before fire exposure).
- Appearance
- Straight longitudinal fractures
- Orientation
- Parallel to bone's long axis
- Follows
- Haversian structural directions
- Indicates
- Burning after desiccation, longer postmortem interval
Common questions
How does a dry bone fracture pattern differ from a fresh bone burn pattern?+
Fresh, hydrated bone tends to fracture in curved, checkerboard, or transverse patterns as residual moisture and collagen react to heat, while desiccated bone lacks that moisture and instead splits along its inherent structural grain, producing the straighter longitudinal cracks characteristic of a longer postmortem interval before fire exposure.
Can dry bone fracture pattern alone give a precise postmortem interval?+
No. It indicates that significant time and moisture loss occurred before burning, which supports a qualitative judgment of longer versus shorter postmortem interval, but the pattern by itself does not yield a specific number of days or weeks without additional contextual and environmental evidence.
Related terms
- Calcined Bone
- Bone heated to above approximately 700°C, resulting in complete combustion of the organic component (collagen), leaving only mineral hydroxyapatite; characterised by white...
- Crazing
- A mosaic network of intersecting surface fissures on burned bone, produced by differential contraction of the outer bone surface relative to the...
- Delamination
- The separation of the outer table of bone from the underlying diploe or cortex in curved sheets during green-bone burning; produced by...
- Green Bone Fracture Pattern
- Curved transverse fractures running approximately perpendicular to the long axis of a bone, with a stepped or warped cross-sectional profile; characteristic of...
- Hydroxyapatite (HA)
- The calcium phosphate mineral [Ca10(PO4)6(OH)2] that comprises approximately 70 per cent of bone mass; survives fire at all temperature stages, sintering and...
- NFPA 921
- US National Fire Protection Association Guide for Fire and Explosion Investigations. The internationally accepted methodology Indian fire investigators and SFSL fire divisions...
- Pope-Smith Framework
- The 2004 analytical framework distinguishing perimortem from postmortem fire exposure using fracture geometry, cross-section colour uniformity, periosteal behaviour, and anatomical integrity; explicitly...
- Shipman Colour Stages
- The five-stage colour classification (yellow-tan, brown, black, blue-grey, white) published by Patricia Shipman and colleagues in 1984, corresponding approximately to temperature ranges...
- ZooMS (Zooarchaeology by Mass Spectrometry)
- A peptide mass fingerprinting method using collagen fragment masses to identify bone to species level; applicable to burned bone samples where conventional...